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RRB NTPC Time and Work — practice questions

Explore 78 free Time and Work questions in RRB NTPC Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Time and Work questions and exercises with answers

Showing questions 1–30 of 78.

As the number of workers on a job increases, the time taken to finish it:Read the answer and worked solution →If 6 men finish a job in 10 days, how many days will 4 men take at the same rate?Read the answer and worked solution →If 12 workers can complete a task in 8 days, 16 workers will complete it in:Read the answer and worked solution →A can do a piece of work in 10 days and B in 15 days. Working together they finish it in:Read the answer and worked solution →A and B together finish a job in 12 days. A alone takes 20 days. B alone would take:Read the answer and worked solution →A is twice as fast as B. Working together they finish a job in 8 days. A alone would take:Read the answer and worked solution →A pipe fills a tank in 6 hours while an outlet empties it in 8 hours. With both open the tank fills in:Read the answer and worked solution →A can finish a job in 20 days. After working 5 days he leaves. The fraction of work left is:Read the answer and worked solution →For a fixed amount of work, the product of the number of workers and the days taken is:Read the answer and worked solution →Ravi alone digs a trench in 10 days and Sunil alone in 15 days. Both together needRead the answer and worked solution →A tailor stitches a batch in 20 days, her partner in 30 days. Together they finish inRead the answer and worked solution →One mason builds a wall in 6 days, another in 3 days. Working together, the wall is ready inRead the answer and worked solution →Meena can paint a fence in 18 days and Geeta in 9 days. If they join hands, the fence is done inRead the answer and worked solution →X completes a task in 16 days and Y in 48 days. Both working together complete it inRead the answer and worked solution →A, B and C can complete a work alone in 30, 20 and 60 days. All three together needRead the answer and worked solution →Three painters take 12, 15 and 20 days alone. If all three work together, the job takesRead the answer and worked solution →One inlet pipe fills a tank in 6 hours and another in 12 hours. Both open together fill it inRead the answer and worked solution →A farmer can plough a field in 15 days. After he has worked 5 days, the days still needed areRead the answer and worked solution →A does a job in 10 days and B in 15 days. After they work together for 3 days, the part left isRead the answer and worked solution →Two friends clean a hall in 8 days together. One of them alone takes 24 days. The other alone takesRead the answer and worked solution →P and Q together build a shed in 6 days. P alone needs 10 days. Q alone needsRead the answer and worked solution →A, B and C together finish in 4 days; A and B together need 6 days. C alone needsRead the answer and worked solution →Kiran is three times as efficient as Lata, who alone needs 60 days. Together they needRead the answer and worked solution →Dev is 50% more efficient than Esha, who alone completes a job in 30 days. Dev alone needsRead the answer and worked solution →Two workers have efficiencies in the ratio 3:2. The first alone needs 20 days. The second alone needsRead the answer and worked solution →The efficiency of A and B is in the ratio 4:5 and together they need 20 days. A alone needsRead the answer and worked solution →If 12 men can complete a job in 15 days, then 20 men complete it inRead the answer and worked solution →A crew of 15 men finishes a job in 20 days. A crew of 25 men would needRead the answer and worked solution →Six men build a platform in 12 days. To build it in 8 days, the men needed areRead the answer and worked solution →Twenty men can pave a road in 18 days. To finish it in 12 days, the number of men required isRead the answer and worked solution →

Worked practice questions

As the number of workers on a job increases, the time taken to finish it:

  1. Increases in the same ratio
  2. Stays the same
  3. First rises, then falls
  4. Decreases
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Correct answer: D. Decreases

1. Two quantities are in inverse proportion when one rises as the other falls. 2. As the number of workers increases, the time taken to finish the job decreases. 3. Doubling the workers halves the time, so the product of workers and days stays constant. 4. That constant product is the total work to be done. 5. Option A describes direct proportion, which is the opposite relationship. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_

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If 6 men finish a job in 10 days, how many days will 4 men take at the same rate?

  1. 15 days
  2. 12 days
  3. 16 days
  4. 20 days
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Correct answer: A. 15 days

1. Men and days are in inverse proportion, so their product is the total work. 2. The work here is 6 x 10 = 60 man-days. 3. With 4 men, the days needed are 60 / 4. 4. That is 15 days. 5. Fewer men must mean more days, so any answer below 10 would be wrong on inspection. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_

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If 12 workers can complete a task in 8 days, 16 workers will complete it in:

  1. 4 days
  2. 6 days
  3. 9 days
  4. 10 days
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Correct answer: B. 6 days

1. The total work is 12 x 8 = 96 worker-days. 2. This total does not change when the team size changes. 3. With 16 workers the time needed is 96 / 16. 4. That is 6 days. 5. More workers means fewer days, so the answer must fall below 8, which rules out 9 and 10. _Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_

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